You should learn how to properly write accessible image captions as the fediverse has a large amount of blind and visually impaired users who rely on screen readers
Make it easier for everyone to enjoy your pretty Instagram posts and funny tweets.
Right now there is a bit left to be desired when it comes to lemmys accessibility features, but it's a good idea to be mindful of the fact the fediverse and its platforms tends to have pretty universal accessibility features that will likely come to lemmy sooner rather than later
I know there was a subreddit or something that explained how to format the description from the context of Reddit. It would be cool if someone came up with a format to use as the standard for this here.
This is only applicable to inline pictures on text fields. Posting images/videos does not have an alt text field. The closest you can get is using the text field of a post as an alt text field.